The Pivot Table's server-side pivot engine (external pivot engine) uses the Syncfusion packageSyncfusion.Pivot.Engine to gather data from the data source and perform all pivot operations such asaggregation,filtering,sorting,grouping, and more on a separate hosted server and only paged data is sent to the pivot table viewport via web service. Currently, we don't have support to customize the service request for the server-side pivot table. So, we need to provide support to customize the existing request to pass the request in "base64" format within the "beforeServiceInvoke" event and process the request based on the modified request information.